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[Late thrombolysis and electrical stability in acute myocardial infarction. Role of the collateral flow]

J E Cossío-Aranda1, E Lupi Herrera, J A González Hermosillo

  • 1Instituto Nacional de Cardiología Ignacio Chávez, México, D.F.

Archivos Del Instituto De Cardiologia De Mexico
|June 12, 1999
PubMed

Insights

Thrombolytic treatment improves coronary blood flow after myocardial infarction. Poor collateral flow, regardless of treatment, significantly increases the risk of malignant arrhythmias and sudden cardiac death.

Area of Science:

  • Cardiology
  • Internal Medicine
  • Medical Research

Background:

  • Acute myocardial infarction (MI) is a leading cause of cardiac mortality.
  • Assessing coronary blood flow and collateral circulation is crucial for predicting outcomes.
  • Heart rate variability (HRV) may offer insights into autonomic dysfunction post-MI.

Purpose of the Study:

  • To evaluate the impact of thrombolytic therapy timing on coronary flow and arrhythmic events in first MI patients.
  • To investigate the relationship between coronary collateral flow and the incidence of malignant arrhythmias and sudden cardiac death.
  • To assess HRV parameters in relation to thrombolytic treatment and coronary flow.

Main Methods:

  • A cohort of 249 patients with first acute MI was divided into three groups based on thrombolytic treatment timing.
  • Coronary angiography was performed to assess anterograde (TIMI) and collateral (Rentrop scale) flow.
  • Heart rate variability studies were conducted, and arrhythmic events were monitored during follow-up.

Main Results:

  • Thrombolytic treatment groups (within 6 and 6-12 hours) demonstrated significantly better anterograde and collateral flow compared to the no-thrombolysis group.
  • Patients without thrombolysis exhibited altered HRV, with lower high-frequency power and a higher low/high-frequency ratio.
  • Poor collateral flow (TIMI 0-2, Rentrop 0-2) was associated with a higher incidence of malignant arrhythmias and cardiac sudden death, independent of thrombolytic treatment.

Conclusions:

  • Thrombolytic therapy improves coronary blood flow following acute MI.
  • Poor collateral circulation is a significant predictor of adverse arrhythmic events and sudden cardiac death, even with successful thrombolysis.
  • HRV may serve as a non-invasive marker for autonomic dysfunction in MI patients, correlating with flow parameters.

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